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  1. [aerial photography] In aerial photography, the point on the ground vertically beneath the perspective center of the camera lens. Media\nadir.gif
  2. [astronomy] In astronomy, the point on the celestial sphere directly beneath an observer. Both the nadir and zenith lie on the observer's meridian; the nadir lies 180 degrees from the zenith and is therefore unobservable. Media\zenith.gif

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